* Lack of fuel: If the engine is not getting enough fuel, it will need to be choked in order to create a richer fuel mixture. This can be caused by a dirty carburetor, a clogged fuel line, or a faulty fuel pump.
* Cold weather: Briggs and Stratton engines are designed to run best in warm weather. When the engine is cold, it may need to be choked in order to provide a richer fuel mixture that will help it to start.
* High altitude: At high altitudes, the air is thinner and there is less oxygen available. This can make it more difficult for the engine to get enough oxygen, so it may need to be choked in order to create a richer fuel mixture.
If you find that your 5.5 hp Briggs and Stratton engine is needing to be choked half closed in order to run, it is important to troubleshoot the problem in order to determine the cause. This will help to ensure that the engine is running properly and efficiently.
